276 PROCEEDINGS OF THE NATIONAL MUSEUM vol. loi 



ience they may be kept in microvials of glycerol attached to the 

 pins bearing the specimens from which they were extracted after 

 relaxation. Study of the aedeagus has shown that material for- 

 merly referred to Coiialcaea humphreysii (Thomas) contains two 

 distinct species and also that United States records of C. poecila 

 Hebard are in error. The considerable variability of the male 

 cercus that occurs in C. huachucana Rehn was not previously rec- 

 ognized, and examination of large series now suggests that C. . 

 coyoterae Hebard, typical specimens of which seem quite distinct 

 from huachucana, is in reality a subspecies of huachucana. Most 

 of the diagnostic characters have been illustrated, thus permitting ; 

 brief descriptions. To avoid repetition characters common to both i 

 genera treated are given only once. 



James A. G. Rehn, Academy of Natural Sciences of Philadel- • 

 phia; Dr. T. H. Hubbell, University of Michigan; Dr. Joseph i 

 Bequaert, Museum of Comparative Zoology ; and Dr. R. H. Beam- 

 er. University of Kansas, were most cooperative in making their ■ 

 entire collections of these grasshoppers available for study. This 

 material, supplementing that in the United States National Mu- 

 seum, has made it possible to examine all the existing^ holotypes 

 and lectotypes involved and to study the principal important series 

 as well. The following individuals also contributed helpful speci- 

 mens or field notes: Dr. Irving J. Cantrall, University of Michi- 

 gan; Kenneth R. Hobbs, Pomona, Calif.; W. W. Jones, Douglas, 

 Ariz.; Dr. E. R. Tinkham, Indio, Calif. To Mr. Rehn I am espe- 

 cially grateful for many helpful courtesies and for sending me 

 numerous personal field notes. Dr. Hubbell and Dr. Cantrall gen- 

 erously placed at my disposal a new species, complete with notes 

 on its distinguishing characters, which the latter had originally 

 intended to describe. Dr. H. Radclyffe Roberts, of the Academy 

 of Natural Sciences of Philadelphia, kindly advised me on generic 

 relationships based on his extensive and largely unpublished 

 studies of Mexican Melanoplini. Finally, I am indebted to H. C. 

 Wilcox, R. C. Bonde, and Bruce Denman, of the United States 

 Department of Agriculture, for photographing specimens. 



All the drawings are my own work. 



Grasshoppers of the Conalcaea complex belong to the tribe 

 Melanoplini,- and the two genera treated have the following char- 

 acters in common: 



* The type of Barytettix humphreysii (Thomas) apparently no longer exists. Hebarri (Proc. 

 Acad. Nat. Sci. Philadelphia, vol. 79, pp. ]-ll, 1927), who reviewed the tyre= of species of Orthop- 

 tera described by Cyrus Thomas, reported that this type was missing. 



■•'I have followed Roberts (Proc. Acad. Nat. Sci. Philadelphia, vol. 99. p. 202. 1947) in adopting 

 the tribal name Melanoplini instead of using' the long-used group name Melanopli, 



